抄録
A collaborative project entitled 'Reclamation of Tianjin alkali soil by desulfurization by-product, Gypsum' was established in 1996 between Yokkaichi University and Tianjin Academy, Tianjin City, China, through International Center for Environmental Technology Transfer (ICETT). This paper describes the work planned in this project, the nature of general and Tianjin alkali soils, and the scope for amelioration of Tianjin alkali soil. Tianjin alkali soil seems to be distributed in the area of saline soil, and it would be difficult to demarcate between alkali soil and saline soil in Tianjin. However, chemical analysis of the soils from two locations for our field experiments in Tianjin shows that these soils are alkaline soil although the exchangeable sodium percentage (ESP) is lower than that of the alkali soil classified by the Department of Agriculture of USA. The results of two field experiments with Gypsum in other places in China conducted by other scientists support that crop productivity in Tianjin can also be increased by the desulfurization by-product, Gypsum, through reclamation of Tianjin alkaline soil. It is likely that the amount of Gypsum required for the reclamation of Tianjin alkali soil will be much lower than that used for other alkali soils in China.
